Routing error in Scrumbler_settings#show

[lcezermf]

I'm usign Redmine 1.4.6 and a have to use this plugin. Well, the instalation was ok and a I can see the plugin in Administration -> Plugins, but when a enter in my project, go to the tab Scrumbler and click in the settings link a have this error message ->

ActionController::RoutingError in Scrumbler_settings#show
Showing vendor/plugins/redmine_scrumbler/app/views/scrumbler_settings/_sprints.erb where line #19 raised:
No route matches {:controller=>"scrumbler_sprints", :action=>"settings", :project_id=>#<Project id: 1, name: "My first test project", description: "My first awesome project !", homepage: "", is_public: true, parent_id: nil, created_on: "2013-01-14 09:45:16", updated_on: "2013-01-14 09:45:16", identifier: "swa", status: 1, lft: 1, rgt: 2>, :id=>1}

The Full trace -> http://pastie.org/5688386

I checked the routes.rb in plugin directory, apparently everything is ok.
Anybody can Help me to fix this ? Thanks